utils/genrandconfig: remove spurious semicolon

From flake8:
utils/genrandconfig:429:21: E703 statement ends with a semicolon
1     E703 statement ends with a semicolon

Fixes: d3e029575c29cad2ba40cce7bf4270a28b83870e

Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

utils/genrandconfig

@@ -429,7 +429,7 @@ def fixup_config(sysinfo, configfile):
 
     if 'BR2_TARGET_ARM_TRUSTED_FIRMWARE=y\n' in configlines and \
        'BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM=""\n' in configlines:
-        return False;
+        return False
 
     if 'BR2_TARGET_ARM_TRUSTED_FIRMWARE=y\n' in configlines and \
        'BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION=y\n' in configlines and \